01 - Bring 4 cups of water to a rolling boil in a large pot. Add the salt and stir until dissolved.
02 - Add the spaghetti to the boiling water. Cook until al dente, stirring occasionally to prevent sticking. Reserve about 1 cup of the starchy cooking water before draining.
03 - While pasta cooks, add the black pepper to a large skillet over medium heat. Toast for 1 minute until fragrant, stirring constantly.
04 - Pour 1/2 cup of the reserved hot pasta water into the skillet with the toasted pepper. Let it simmer gently.
05 - In a mixing bowl, combine the grated Pecorino Romano with a few tablespoons of hot pasta water. Mix vigorously to form a thick, smooth paste.
06 - Transfer the cooked spaghetti to the skillet with the pepper infusion. Toss thoroughly to coat. Remove from heat.
07 - Gradually incorporate the cheese paste into the pasta, tossing rapidly. Add more reserved pasta water as needed to achieve a creamy, silky sauce that evenly coats each strand.
08 - Serve immediately while hot. Top with additional grated Pecorino Romano and a fresh grinding of black pepper.